So, if you think you're not an idiot, let me run you through a checklist of things you must have.
1) An active antivirus. Yes, that includes you, Mac users. (Linux users, you're pretty much fine.) That should be on your phone, too.
2) 2 factor authentication, on everything that supports it. If you have a spare phone that you can use for it (that you don't give to anyone and, preferably, is not connected to your name), then that should be your 2FA phone. (Two factor authentication would have been my saving grace in the Paypal situation, but it wont always be.) Google Authenticator is also an awesome tool.
3) Different, and strong, passwords for every single site you use. 16 characters minimum. Seriously. Brute forcing is no joke, especially on sites where they allow unlimited login tries. Not only that, they must be different so you're not caught with your pants down if a website's database gets leaked.
4) A way so you don't have to TYPE those passwords. Keyloggers are a bitch, and will steal your passwords, your credit card info, and more, right as your typing them. You can use an encrypted Notepad file stored on the cloud (not the safest thing in the world, because your clipboard could be at risk too), or you can use a password manager like Lastpass or KeePass. Password managers are excellent, because (1) you don't have to type passwords for every site you use, and (2) they're encrypted with a master password as your key. There's also programs like KeyScrambler which are reported to be pretty good.
5) An active firewall on both your computer and your router. Yes, firewalls for routers are different than firewalls for computers, and you should have both.
6) A secure autofill program for when you need to enter your credit card or Paypal info. Lastpass does this pretty well. Preferably, this autofill should be protected by a password (again, Lastpass does this pretty well).
7) A strong password on your computer, and, preferably, a 2nd factor (like a biometric scan or a phone/USB unlock) for your computer. (Also, keep your computer OFF when not using it, and preferably, disconnect it from power so it can't turn on without your control!)
8) As many backdoors closed as possible. Some backdoors on Windows computers include Universal Plug n Play, Teamviewer, and allowing remote access protocols. I understand TeamViewer is an important tool; however, it should not ever be running when you're not using it.
After speaking with some people, I also found out that it's very, very likely to get hacked while travelling. Hotel Wifi, Starbucks Wifi, plane Wifi, all of these networks are often more vulnerable than you think! For your safety, use a VPN while travelling. HideMyAss is a popular one. There are several others. You could even make your own, if you wanted.
However, keep in mind: even while following these tips, you could still be vulnerable. People can spoof your phone so they can get into your 2 factor sites. People can take advantage of database breaches and steal your login info. Hackers are always coming up with new ways to steal info and money. (There are also more tips that might help, so please, feel free to add anything! I'm not a computer expert!)
Your job, though, is to lower the likelihood of something ever happening to you. There is no magic armor, but you could at least be wearing a bulletproof vest.
Protect your a$$.
